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Fluoropolymer liquid composition

a technology of fluoropolymer and liquid composition, which is applied in the field of fluoropolymer liquid composition, can solve the problems of high manufacturing cost of prior art laminates using preformed fluoropolymer films, and the inability to delaminate after years of outdoor exposure, and achieves the effects of fewer overall processing steps, good durability of fluoropolymer coated films, and strong adhesion to the substra

Inactive Publication Date: 2011-04-14
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces processing steps, achieves strong adhesion, and allows for thinner, more cost-effective fluoropolymer layers with enhanced durability and barrier properties, improving the longevity of photovoltaic modules.

Problems solved by technology

However, laminates of preformed fluoropolymer films on polymeric substrates having a bond which will not delaminate after years of outdoor exposure are difficult to make.
Therefore, prior art laminates using preformed fluoropolymer films are expensive to manufacture and / or require capital intensive equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Example 1 demonstrates the adhesion of fluoropolymer coatings to unmodified polymeric substrate films. A variety of polyester diols and triols (Desmophen®, Bayer MaterialScience) cross-linked into PVF based fluoropolymer coatings using the isocyanurate trimer of hexamethylenediisocyanate (Desmodur® N-3300, Bayer MaterialScience) show adhesion to unmodified PET. The polyesters shown in Table 1 are representative.

TABLE 1Polyester Diols and Triols.Desmophen ®diol-equivalentpolyesterDiol-12triolAcidwtMPMWF-2060BEGBDTMPAA66030S-1028-55HDPA1020202000F-2035HDTMPAA21635650S-1040P-55EGBDAA1020302000S-101P-55EGAA1020602000S-101P-110EGAA510601000S-105-55HDAA1020602000S-107-55NPGAA1020252000S-108-46PGAA122010EG = ethylene glycolBD = 1,4-butanediolHD = 1,6-hexanediolNPG = neopentyl glycolPG = propylene glycolTMP = trimethylolpropaneAA = adipic acidPA = phthalic acid

Procedure:

1. Each of the polyesters shown in Table 1 were combined with a 42% solids PVF dispersion in propylene carbonate (30 parts...

example 2

Example 2 demonstrates the effects of compatible cross-linked adhesive polymer composition on the adhesion strength of fluoropolymer coatings on unmodified polymeric substrate films. Some compatible cross-linked adhesive polymers function better than others and can promote adhesion at much lower concentration. Table 3 shows results for Desmophen® F-2060B and S-101P-55 polyesters varied between 10 and 30 parts polyester per 100 parts PVF. Table 4 shows results for Desmophen® F-2060B from 1 to 10 parts polyester per 100 parts PVF. Samples 10 to 25 were each made using a heavier PET web, 5 mil Mylar® A (DuPont Teijin Films).

TABLE 3Adhesion Sensitivity to Polyester Type and Concentration.Desmophen ®PPH polyesteravg peelSamplepolyesteron PVF(KG / in)10F-2060B103.711F-2060B153.512F-2060B202.313F-2060B252.814F-2060B302.815S-101P-55100.716S-101P-55151.417S-101P-55201.018S-101P-55251.919S-101P-55302.5

TABLE 4Adhesion Results for Low Concentration Desmophen ® F-2060B Polyester Formulations.Desmo...

example 3

Example 3 demonstrates the effects of cross-linking agent composition on the adhesion strength of fluoropolymer coatings on unmodified polymeric substrate films. Table 5 shows adhesion results for a variety of polyesters as a function of the amount of Desmodur® N-3300 cross-linking agent used. Best results are obtained with an equivalent or excess of cross-linking agent.

TABLE 5Adhesion as a Function of Cross-linking agent Concentration.Desmophen ®Mole %polyester (30Cross-linkingavg peelSamplePPH on PVF)agent(KG / in)26F-2060B750.327F-2060B1002.028F-2060B1252.129F-2060B1502.230S-1028-55750.231S-1028-551000.332S-1028-551250.633S-1028-551500.734F-2035750.535F-20351001.336F-20351252.237F-20351501.638S-101P-55750.239S-101P-551002.640S-101P-551252.241S-101P-551502.142S-105-55750.243S-105-551002.044S-105-551252.445S-105-551502.3

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Abstract

A liquid fluoropolymer coating composition includes a fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride, solvent, a compatible cross-linkable adhesive polymer, and a cross-linking agent.

Description

BACKGROUND INFORMATION1. Field of the DisclosureThis disclosure relates to a fluoropolymer liquid composition.2. Description of the Related ArtPhotovoltaic (PV) cells are used to produce electrical energy from sunlight, offering a more environmentally friendly alternative to traditional methods of electricity generation. These solar cells are built from various semiconductor systems which must be protected from environmental effects such as moisture, oxygen, and UV light. The cells are usually jacketed on both sides by encapsulating layers of glass and / or plastic films forming a multilayer structure known as a photovoltaic module. Fluoropolymer films are recognized as an important component in photovoltaic modules due to their excellent strength, weather resistance, UV resistance, and moisture barrier properties. Especially useful in these modules are film composites of fluoropolymer film and polymeric substrate film which act as a backing sheet for the module. Such composites have ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D127/14C09D127/16C08J7/043
CPCB32B17/10018Y10T428/26B32B2367/00C08G18/4063C08G18/4211C08G18/4238C08G18/4241C08G18/44C08G18/6279C08G18/792C08J7/047C08J2367/02C08J2377/00C08J2379/08C08J2427/14C08J2427/16C08J2475/04C08L67/00C09D127/14C09D127/16C09D175/04H01L31/0481B32B17/10788Y10T428/266H01L31/049Y02E10/50C08L2666/02Y10T428/31507Y10T428/3154C08J7/0427C08J7/043B32B27/08C08J5/18
Inventor SNOW, LARRY GLEN
Owner EI DU PONT DE NEMOURS & CO
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